Truing device for grinding wheels



May 25 1926. 1,585,706

B. M, w. HANsoN TRUING DEVICEKFOR GRINDING WHEELS bb attoz nu? May 25 192s. 1,585,706

B. M. W. HANSON TRUING DEVICE FOR GRINDING WHEELS Original Filed 001% 10', 1922 2 Sheets-Shea?l 2 Patented May 25, 1926.

UNITED STATES PATENT OFFICE.

BENGT M. W. HANSON, DECEASED, O F HARTFORD, CONNECTICUT; EINAR A. HANSON AND CLARENCE E. WHITNEY EXECUTORS OF SAID BENGT M. HANSON, DE-

CEASED.

TRUING DEVICE FOR GRINDING WHEELS.

Original application tiled October 10, 1922, Serial No. 593,487. Divided and this application filed August 1, 1924. Serial No. 729,504.

This application is a divisional of my co-pending application Serial No. 593,487, filed October 10, 1922, for metal working machine.

The present invention relates particularly to the device for truing the grinding wheel and has as its object to provide a mechanism of this sort having various features of novelty and advantage. More particularly, the aim of the invention is to make certain improvements in a truing device of the type shown in my co-pending application Serial No. 391,013, tiled June 23, 1920, for truing device.

In the accompanying drawing, wherein I have shown, for illusti'ative purposes, one` embodiment which the invention maytake:

Figure 1 is an assembly View of my improved truing device and grinding` wheel, the truing device being shown in side elevation with parts in section; a

Fig. 2 is an elevational `View looking at the front or right hand end of Fig. l.;

Fig. 3 is a top plan View of the trumg device' Fig. 4 is a transverse lsection taken on line 1 -4 of Fig. 1 and looking in the direction of the arrows.

Fig. 5 is a detail view; and

Fig. 6 is a view of a special thread.

Referring to the drawings in detail, a denotes a lixed bed or pedesta on which is mounted for movement towards and from the work a slide b carrying a journal box c in which is joui-nailed a spindle or shaft for the grinding wheel d. The work or member to be threaded, and which is here designated by the letter e, is supported in any suitable manner as, for instance, by head and tail stock centers f, and these centers may be slidably carried by. a rocking bed in the manner described in my said copending application Serial No. 593,487. The truing device is supported in a post or support g carried for angular adjustment in a slide It which is adjust-ably mounted on a bracket z' secured to the bed a. The truing device has a re-sharpenniV tool, such as a diamond point It', which is adapted to be indexed to operate on thc respective faces oi' the grinding wheel and to be moved back and forth in each indexed position, as hereinater described more in detail.

In the present illustrative disclosure, the grinding wheel slide I) is mounted for adjustable movement on ways l0 which are generally at right angles to the axis of the work. The slide b, together with the grinding wheel carried thereby, may be moved up to, and away from, the work in any suitable manner, as by rotating the screw l1. The bearing box c, in which is journalled the grinding wheel spindle 12, is angularly adjustable on the slide b to permit the grinding wheel to be brought into inclined position corresponding to the lead of the thread to be ground.I As here shown, this box is mounted in a way 13, the center of curvature of which is the center of the wheel d, by which is meant a point at the axis of the wheel which is included in the plane bisecting the vcutting' edge of the wheel so that the axis about which the wheel may be angularly adjusted is on the line a/-b (see Figs.- 1 and 3)'substantially perpendicular to the axis of rotation of the work. The grinding wheel spindle 12 may be-driven in any suitable manner, as by means of a belt, not shown, passing about a pulley 14.

The slide or bearing member h is adapted to be fixed in any desired position of adjustment to the bracket z' by bolts 20, the heads of which engage in T-slots 21 which are parallel to the ways 10 on which the grinding wheel slide is adjustable. Journalled in the bearing member h and adapted to be secured in any angular position of adjustment, as by means of a clamping bolt 22, is a pin or stud 23 to the forward end of which is fixed the post or support g having a verticallydisposed bearing 24, the axis of which intersects the axis of the pin 23 at right angles. The axis of the pin 23 is coincident with tlie line a-), that is to say, it is in a line passing substantiall through the point about which the grinding wheel is angularly adjustable and perpendicular to the axis of the work. Mounted in the bearing 24 is a hollow shaft 25 having, at

its lower end, a projection 26 which carries a bolt or bearing member 27, the axis of which is substantially at right angles to the axis of the shaft 25 and parallel to the axis of the pin 23 when the truing device is in mid position, that is, in a position'to operate upon the flat or peripheral edge of the grinding wheel. J ournalled on this bearing member 27 is an arm 28 in which is mounted for longitudinal adjustment a sharpening or truing tool k, here shown as a diamond point. When the shaft 25 and the arm 28 are in the mid position shown in the drawings, the diamond point lies substantially in theline a-b. The arm or tool carrying part 28 is provided with a segmental ,gear 32 with which meshes abevel gear 33 carried by a shaft 34 journalled in the shaft 25 and carrying an operating handle 35 at its upper end. It will be seen that, by swinging the handle 35 in opposite directions, the tool carrying part 28 will be oscillated through the gears 32 and 33 so as to move the diamond point k across the face or edge of the grinding wheel being resurfaced. The shaft 25 and the parts mounted thereon, and which, as a whole, may be considered as the carria may be turned in the bearing 24 in or er to bring the diamond point into operative relation with any face of the grinding wheel, and, for the purpose of indexing lit to the proper position, there is keyed'to the upper end of the shaft 25 a plate 36 carrying, in a suitable T-slot 37, adjustable dogs 38 adapted to abut againsta stop 39 on the post g.

For the purpose of holding the truing de'- vice in mid-position, the plate is provided with a recess 41 in which a spring pressed plunger 42 is adapted to engage. The platev carries, on its edge, a scale 43 which co` operates with a zero mark'44 on the stop 39 so that the dogs may be properly adjusted. The shaft 25 may be locked in any position of adjustment by turning the set screw 45. The numeral 48 designates a gauge arm carried by a pin 49 mounted in the bearing member 27. The lower end of this gauge arm carries a screw 50, the adjustment of which in the gauge arm is determined by a plurality of interchangeable gau e members in the form of fiat washers or isos one of which gauge members 51 is shown interposed between the head of the 'screw 50 and the gauge arm. In Fig. 1, the auge arm is shown in gaugin position; uring the grinding operation 1t is raised into inoperative position. By means of this gauge, the extentof the flat or truncated portion 'of the grinding wheel is very accurately determined and produced. It is understood that as many gauge washers 51 will be provided as there are pitches of threads to be cut.

To set up the truing device for resurfacing the wheel, where, for instance, a U. S. standard thread is being cut (in which case the faces ofthe thread are at an angle ot' 60 o and the thread is truncated) the post or support g will be clamped in upright or vertical position and the proper gauge meniber 51 will be selected for position upon the gauge arm 48. The diamond point will then be brought into engagement with the end of the screw50. The gauge will 'then be thrown into inoperative position, and thil dogs 38 will be so adjusted that when respectively brought into engagement with the stop 39 the diamond point is in position 'to resurface the side faces of the wheel at the proper (60) angle in relation to each other. The shaft 25 will now be indexed or turned to bring one of these dogs into engagement with the stop 39 and the shaft 25 is then locked in this position by turning up the clamping screw 45. The handle 35 is oscillated to move the diamond point back and forth across the side face of the wheel with which it is in engagement. After this side face is thus resurfaced, the clamping screwl 41is loosened and the shaft 45 is turned until the other dog 38 engages the stop 39 and then the shaft is clamped in this position. The handle 35 is then oscillated to .move the diamond point back and forth across the other side face of the grinding wheel. After both side faces of the grinding wheel have been retrued, the shaft 25 is turned to a position where the plunger' 42 engages in the recess 41 of the plate 3G. Then the diamond point is oscillated to effect the proper truncation on the periphery of the wheel.

When, for one reason or another` it is desired to retrue the edge of the grinding wheel on a line other than that lying in a plane including the axis of the work, the post g may be inclined by turning the pin 23 on its axis to the desired angle and then clamping it in this position by the bolt 22. This may be desirable where the pitch of the thread is extremely coarse or where a special thread 'is to be ground, the angle of the sides of which is measured on the normal pitch instead of the linear pitch of the thread ofvsuch a shape as shown in Fig. G is to be ground the angle of inclination of the support or post g may be determined by the scale 43. This is a new feature which isy of considerable value from a commercial standpoint. When the thread such as shown in Fig. 6 is to be ground the side faces 55 may be resurfaced with the post g in upright position and then the surfaces 56 retrued with the post g in inclined position It is to be noted that the axis of the pin 23 lies in the line (L -b. and the diamond point is indexible about the point of intersection of that line and the axis of the shaft 25.

Macnee It will be seen that the holder" 57 for the diamiond point is disposed at' a slight angle in the arm 28. This arrangement is provided so that,- when one portion of the diamond point is worn, by merely turning the holder on its axis a new sharp edge of this diamond point is in position to operate upon the wheel.

The truing device is in fixed relation to the work gauge after the latter has been adjusted to a piece of work and fixed in position, it being remembered that by this adjustn'ient the work gauge is broughtinto fixed ielation with the Wheel. Consequently, these three parts, the work gauge, the wheel and the truing device, being oncel set for a piece of work of a given character, always remain so set with relation to one another for other work of like character.

As many changes could be made inthe above construction and many apparently widely different embodiments of this invention could be made without departing `from the scope thereof, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense. f

It is also to be understood that the langauge used in the following claims is intended to cover all of the generic and specific features of the invention herein described j and all statements of the scope of the invention which, as a matter of language, might he said to fall therebetween.

I claim as m Y inventionz..

l. A truing evice including an angularly indexible carriage, means for indexing it, a tool on said carriage, and means Jfor reciprocating said tool, said carriage being angupendicular to the axis about which sai support is angularly adjustable, a resurfacing tool on said carriage, and means for reciprocating said tool substantially in a plane including the axis about which said su port is adjustable and to which plane the axis about which said carriage is inflexible is perpendicular.

'3. A truing device of the character described, including an angularly adjustable support, a carriage angularly indexible in said support about an axis substantially perpendicular to the axis about which said support is adjustable, a resurfacing-tool mounted for longitudinal adjustment substantially on the line of the axis of said support, and means for reciprocating said tool.

4. A truing device of the character de- .larly adjustable relative to sai scribed, including an an ularly adjustable sup ort, a hollow shaft journalled therein at right angles tothe axis of said support, means for indexing angularly said shaft about its own axis, a bearing member car-1 ried by said shaft land parallel to the axis about which said support is adjustable, an arm journalled on said bearing member, a resurfacing toollongitudinally adjustable in said arm, a segmental gear on said arm, and a Shaft journalled in said hollow shaft and having a gear meshing with said segmental gear.

5. In combination, a grinding wheel; and a truin device including a 4support angularly a` justable relative to said wheel and about a diametrical line passing through said grinding wheel, an angularly indexiblev carriage on said support, and a yresurfacing tool mounted for reciprocating on said carriage. L

6. In combination, a grinding wheel; and a truin device including a su port angularljT adjustable relative to sai wheel and about a diametrical line passing through said grinding wheel, a carriage angularly indexible in said support about' an axis substantially perpendicular to the axis about which said support is angularly adjustable, asingle resurfacin tool on said carriage, and means for reciprocatin/ said tool substantially in a plane inclu ing the axis about which said support is angularly adjustable and to which plane the axis about which said carriage angularly adjustable is perpendicular, said grinding wheel being movable to and from said tool on said diametrical line.

7. In combination, a grinding wheel; vand a truing device including a su port anguwheel and about a diametrical line passing through the ,center of the wheel, a carriageangularly i11- dexible in said support about an axis substantially perpendicular to said line, and a resurfacing tool on said carriage and movable in a plane including the said line and substantially perpendicular to the axis about which said carriage is indexible.

8. In combination, a grinding Wheel an. gularly adjustable about a diametrical line passing through its center; and a truing device angularly adjustable relative to said wheel and about that line and having a reciprocable resurfacing tool angularly inlexible about an axis perpendicular to that 9. In combination, a grinding wheel movable on and angularly adjustable about a diametrical line passing through its center and included in a plane bisectin the angle of the cutting edge of said grin in wheel;

and a truing4 device angularly a justable 10. lln combination, a Work holder on which the Work is rotaed; a grinding Wheel nngularly adjustable about a diametrica line passing through its center and intersecting the axis of the work, said .line being included in a plane r)isectin the angley of The cutting edge of "the grinding Wheel; and

a truin device including a supporll angularly a justable about that line as an axis, a carriage in said su port inflexible about an axis intersectin t at line, and a resurfacin tool on sai carriage ada `ted to be move in a plane including that 'ne.

BENGT M. W. HANSON. 

